91671761 has 4 divisors (see below), whose sum is σ = 93622272. Its totient is φ = 89721252.

The previous prime is 91671739. The next prime is 91671763. The reversal of 91671761 is 16717619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16717619 = 23 ⋅726853.

It is a cyclic number.

It is not a de Polignac number, because 91671761 - 2¹⁰ = 91670737 is a prime.

It is a super-2 number, since 2×91671761² = 16807423529682242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91671763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 975185 + ... + 975278.

It is an arithmetic number, because the mean of its divisors is an integer number (23405568).

Almost surely, 2^91671761 is an apocalyptic number.

It is an amenable number.

91671761 is a deficient number, since it is larger than the sum of its proper divisors (1950511).

91671761 is a wasteful number, since it uses less digits than its factorization.

91671761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1950510.

The product of its digits is 15876, while the sum is 38.

The square root of 91671761 is about 9574.5371167488. The cubic root of 91671761 is about 450.8982240110.

The spelling of 91671761 in words is "ninety-one million, six hundred seventy-one thousand, seven hundred sixty-one".